JPS58225457A - Information processor - Google Patents

Abstract

PURPOSE:To set the area of an access address to a storage circuit with a simple firmware and in response to the working state, by qualifying the holding contents of an address holding means in response to the working state storage contents when an address request is given to the storage circuit. CONSTITUTION:An information processor is provided with a working state storage circuit 1, an address register 2, an adder circuit 3 and a storage circuit 4. A firmware stores a working state 10 of the information processor in the circuit 1. The circuit 3 delivers the holding contents of the register 2 to the circuit 4 as they are when the circuit 3 receives no qualification indicating signal 12 from the circuit 1. When the circuit 3 receives the signal 12, a fixed number is added to the upper 2-bit 13 of an access address 11. Then the bits 13 form an access address 15 together with a lower bit 14 of the address 11, and this address 15 is delivered to the circuit 4.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an information processing device, and particularly to an information processing device that can set an access address area for a storage circuit in response to an operating state.

An example of such an information processing apparatus is an information processing apparatus that performs fingerprint verification. Fingerprint verification is performed by sequentially writing past fingerprint data (file fingerprints) stored in the disk device into memory and comparing them with current fingerprint data (search fingerprints) written in other areas of the memory. , the write area of the memory is changed depending on whether the file fingerprint or search fingerprint is written.

A conventional information processing device of this type includes an operating state storage circuit that stores an operating state and an address register that holds an access address to the storage circuit.

Such a conventional configuration has the disadvantage that the firmware is complicated because the firmware checks the storage contents of the operating state storage circuit and changes the access address to be accessed in the address register in response to the result.

An object of the present invention is to provide an information processing device with simplified firmware.

The device of the present invention includes: inactive state storage means for storing an operating state; address holding means for holding an address for accessing a memory circuit; and storage contents of the operating state storage means when an access request to the memory circuit is received. The present invention is characterized in that an address modification means is provided for modifying the contents held by the address holding means in response to the above.

Next, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

This embodiment includes an operating state storage circuit 1 and an address register 2.
, an adder circuit 3, and a memory circuit 4.

The firmware stores the operating state 10 of the information processing device in an operating state storage circuit. When there is a request to access the memory circuit 4, the firmware uses the access address 11.
is stored in the address register 2, but this access address 11 is the same regardless of the contents stored in the operating state storage circuit 1.

The addition circuit 3 receives the modification instruction signal 12 from the operating state storage circuit 1.
When not received, the contents held in the address register 2 are outputted as they are to the storage circuit 4. When the adder circuit 3 receives the modification instruction signal 12, it adds a predetermined nine constant number to the upper two bits 13 of the access address 11, and then
An access address 15 is formed together with the lower pit 14 of the access address 11 and output to the storage circuit 4.

According to the present invention, with the above-described configuration, the firmware can be simplified because the firmware only needs to set the same access address in the address holding means regardless of the contents stored in the operating state storage means.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the present invention. 1...Operating state storage circuit, 2...Address register, 3...Addition circuit, 4...
・Memory circuit, 10...Operating status, 11...
...Access address, 12...Modification instruction signal, 13...Higher bit, 14...Figure 1

Claims (1)

[Scope of Claims] Operating state storage means for storing an operating state; address holding means for holding an address for accessing a memory circuit; and when an address request to the memory circuit is made, the storage contents of the operating state storage means are stored. An information processing apparatus comprising: address modification means for modifying the content held by the address holding means in response to the address modification means.